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J Bacteriol, February 1998, p. 979-984, Vol. 180, No. 4
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

New Flagellin-Specifying Genes in Some Escherichia coli Strains

Yuli A. Ratiner*

Department of Microbiology, Mechnikov Research Institute for Vaccines and Sera (Russian Academy of Medical Science), 103064 Moscow, Russia

Received 16 July 1997/Accepted 13 December 1997

Data for further development of the flagellar antigen genetics of the species Escherichia coli are reported. Two new flagellin genes named fllA and flmA were found in E. coli 781-55, E2987-73, and E223-69, the test strains for E. coli flagellar antigens H44, H55, and H54, respectively (collection of the International Escherichia and Klebsiella Centre of the World Health Organization, Copenhagen, Denmark). Two alleles of fllA were identified that encode flagellar antigens H44 (fllA44) and H55 (fllA55), and the only flmA allele found (flmA54) encodes antigen H54. The sites of their integration in the E. coli K-12 chromosome after P1-mediated transduction were approximately determined and found to be separate from each other and from the known regions of flagellar genes of E. coli and salmonellae. The region of flm54 was found to repress the expression of some alleles of the flagellin gene fliC. In addition, cryptic genes encoding antigens H4 and H38 were found in phenotypically monophasic test strains 781-55 and E2987-73, respectively.

* Mailing address: Mechnikov Research Institute for Vaccines & Sera (Russian Acad. Med. Sci), Pereulok M. Kazenny 5-a, 103064 Moscow, Russia. Phone: (95) 9175460. Fax: (95)-9175460.




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